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Table 5.

Comparison of the main timing and spectral parameters of the transient BeXRBs RX J0059.2-7138 (Sidoli et al. 2015), SMC X-2 (La Palombara et al. 2016), IGR J01572- 7259 (La Palombara et al. 2018), and SXP59.0 (this work).

Parameter RX J0059.2-7138a SMC X-2a IGR J01572-7259a SXP59.0
LX (0.2–12 keV, ×10−37erg s−1) 7 14 3.6 3.5
Porbit (days) 82 18.4 35.6 122.1
Pspin (s) 2.76 2.37 11.58 58.95
PF (%) 8.9 35 43 53
NH (10−20 cm−2) 18 ± 3 12 ± 1
kTBB (eV) 93 ± 5
RBB (km)
fBB/fPL (%) 1.7 3.1 1.6 3.5
kTAPEC (keV) 0.21 ± 0.03
NAPEC (×10−3 cm−5) 5 ± 1 4 ± 1
fAPEC/fPL (%) 7 1.8 4.5 1.4
N VII Yes Yes Yes Yes
O VII No Yes No Yes
O VIII Yes Yes Yes Yes
Ne ix Yes Yes Yes No
Ne X No Yes no Yes
Mg XI No No Yes Yes
Si xiii No Yes No No
Si xiv No Yes No No
EFe Kα (keV) 6.6 6.6 6.4 6.3
dBB (km) 3000 1800 400 570
Rm (km) 900 740 1100 1100

Notes.

(a)

For this source the APEC component is considered an alternative to the BB component.

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